# std::chrono::year_month

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< cpp‎ | chrono

Defined in header `<chrono>` |  |
class year_month; |  | (since C++20)

The class `year_month` represents a specific month of a specific year, but with an unspecified day. It is a field-based time point, with a resolution of std::chrono::months.

`year_month` is a TriviallyCopyable StandardLayoutType.

### Member functions

(constructor) | constructs a `year_month` (public member function)
yearmonth | accesses the stored year and month (public member function)
operator+=operator-= | modifies the `year_month` by some number of months or years (public member function)
ok | checks if this `year_month` is valid (public member function)

### Nonmember functions

operator==operator<=> (C++20) | compares two `year_month` values (function)
operator+operator- (C++20) | performs arithmetic on `year_month` (function)
operator<< (C++20) | outputs a `year_month` into a stream (function template)
from_stream (C++20) | parses a `year_month` from a stream according to the provided format (function template)

### Helper classes

std::formatter<std::chrono::year_month> (C++20) | formatting support for `year_month` (class template specialization)
std::hash<std::chrono::year_month> (C++26) | hash support for `std::chrono::year_month` (class template specialization)

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